Multiply paper bag



April 2,8, 1942. w. J. GEIMER MULTI'PLY PAPER BAG Filed March 13, 1959'f8-CJ i zI7 TTozA/E. YJ'

Patented pr. 28, 1942 `MUL'IIPLY PAPER BAG William J. Geimer,Minneapolis, Minn., assignor to Bemis Bro. Bag Co., Minneapolis, Minn.,a corporation of Missouri Application March 13, 1939, Serial No. 261,429

1 Claim.

This inventionrelates to new and useful improvements in multi-ply paperbags of the general character disclosed in my co-pending application,Serial Number 224,467, filed August 12, 1938. I

I'he present application relates more particularly to the` arrangementand location `of the pasted areas provided between the plies of the wallportions rforming the .bag mouth, whereby whenthe bag has been filled,said pasted areas will permit free rolling and `bending of the bagA`mouth walls in the operation of folding` said walls into closingrelation, and whereby said pasted areas will not be intersected by thefold lines formed when the bag top walls are folded into closingrelation. I

An object of the invention is to provide a multi-ply baghaving the`plies of the walls forming the bag mouth, so interpasted that thebagmouth walls may readily befolded into closing and sealing relation overthe contents of the bagl body, to provide what is commonly known to thetrade asa. `Deltaseal closure, and whereby the bag top walls aresymmetrically andy uni iormly folded into closing relation to provide aneatly formed bag closure.

A further object is to provide a bag of the character disclosed, whereinthe pasted areas provided between the plies of the bag mouth, arelocated adjacent to the side edges of the empty bag, when the walls ofthe bag body are folded into flatwise relation, and the pasted areas atone side edge of the bag being relatively larger than those at theopposite side edge thereof.

Other objects of the invention will appear from the followingdescription and accompany- Ing drawing and will be pointed out in theannexed claim.

In the accompanying drawing there has been disclosed a structuredesigned to carry out the various objects of the invention, but it is tobe understood that the invention is not confined to the exact featuresshown as various changes may be made within the scope of the claim whichfollows.

In the drawing:

Figure 1 is a view showing a flattened empty bag with the inventionapplied thereto;

Figure 2 is a top view of Figure l;

Figure 3 is a view showing one of the end walls of the bag mouth foldedinwardly over the contents of the bag, in the initial operation vofclosing the bag mouth;

posed end wall folded over the4 first folded end 55 `4 of sheetmaterial.

wall, whereby oppositely disposed flaps are provided; and

Figure 5 is a view showing the bag mouth completely closed and sealed.

In the selectedembodiment of the invention here shown, there isillustrated in Figure 1, for purposes of disclosure, a conventional formof bag, commonly known to the trade as the flat type. This bag comprisesa body 2 formed from a tube composed of outer and inner plies 3 andOpposite edges of the plies 3 and 4 are overlapped and suitably unitedto provide a longitudinally extending seam, generally indicated by thenumeral 5. When the tube is flattened, as shown in Figures 1 and 2,oppositelydisposed side edges 6 and l are provided. 'Ihe seam 5 is shownlocated adjacent tocne of the side edges as, for example, the edge 6,whereby it is less likely to interfere with the rolling and bending ofthe bag top walls, in the operation of closing the bag mouth. In thedrawing, I have shown the walls of the tube as-being composed of twoplies butit is to be understood that two o r more plies may be utilizedas desired,

without departing from the scope of the invention.

One end of the flattened tube is closed, as indicatedby the vdottedlines in Figure 1, to provide the bottom 8 of the bag. The bottom shownin the drawing, is of the usual satchel type, and is folded intoflatwise, relation with respect` to the oppositely disposed walls 9 andII of the flattened bag, as clearly illustrated in Figures 1 and 2,thereby to facilitate storing the empty bags.

An important feature of the present invention resides in the uniquemanner of inter-pasting the plies 3 and 4 of the wall portions formingthe bag mouth walls, when the bag is expanded,

to receive a charge. The form of bag, shown in the drawing, isrectangular in cross section, whereby the bag mouth is defined byoppositely disposed end walls I2 and I3, and side walls Il and I5. Inthe .operation of closing the bag mouth, the unseamed end wall I2 of thebag mouth is preferably flrst folded inwardly over the contents of thebag body, as shown in Figure 3. The end wall I3 is then folded inwardlyover the end wall I2, as shown in Figure 4, whereby the side walls I4and I5 provide oppositely extending flaps I6 and Il. These flaps aresubseqently folded inwardly over the end walls I2 and I3, one over theother, as shown in Figure 5, and suitably secured together to completelyclose and seal the bag.

To thus fold the multi-ply wall portions forming the bag mouth intoclosing and sealing relation, it is essential that the plies thereof besuitably bonded or pasted together at certain definite locations toprevent the plies from relatively creeping or buckling, when the wallsare folded into closing relation, in order to provide a neat bagclosure. To thus secure together the plies of the bag mouth walls, asuitable paste is applied between said plies in denitely located areas I9, I9, and 2|. All of these pasted areas are located in a common plane.The pasted areas I8 are located adjacent to the side edge 'I of theflattened bag body, and the. areas I9 `and 2| at the opposite side ofthe bag body, as clearly illustrated in Figures 1 and 2. In commercialpractice, it has been found that best results are pasted area 2|, asshown in Figures 1 'and 2,

a suitable distance so as to clear the points 22 which form the adjacent'corners of the bag body, i

when the empty bag is expanded toreceive a charge. It will also be notedthatthe relatively smaller pasted areas I8 are located between the sideedgel o1 the flattened bag body and the vpoints 23, which form thecorners at the opposite sides of the bag body, as shown in Figures 4 and5. l

By thus locating the pasted areas I8, I9, and

2|, it will be noted that when the-bag top walls are folded inwardlyover the contents of the bag bodyinto closing relation, said pastedareas will not interfere with the free rolling and bending of the bagmouth walls in the operation of `closing the bag mouth, nor will they beintersected by the fold lines formed when the bag top walls are foldedinto closing relation, as clearly illustrated in Figures 4 and 5.

The pasted areas I9, I9, and 2| may be inexpensively applied between theplies of the bag walls, as will readily be understood `by referencetoFigures 1 and 2, and provide a sufficient bond between the plies ofthe bag walls to prevent relative creeping of the plies of the bag mouthwalls in the operation of folding said walls into closing relation.

ing its opposed edges secured together to provide a longitudinallyextending seam and whereby the blank will form a tube, one end of saidtube being closed to provide the bottom of the bag and said 4tube beingflattened to provide two walls disposed in fiatwise relation with thelongitudinally extending seam disposed adjacent to one of the side edgesof the flattened bag body, a suitable paste applied in small areasbetween the plies atthe seam side of the flattened bag, relativelysmaller pasted areas at the opposite side of the bag, saidlongitudinally extending seam and pasted areas being so located thatwhen the bag is expanded to receive a charge, said seam and one of saidpasted areas will be disposed in one end wall of the bag body and two ofsaid pasted areas in the side walls of the bag body adjacent to saidseamed end Wall, and the relatively smaller pasted areas being locatedin the opposed end wall of the expanded bag body, and all of said pastedareas and the seam being so arranged that none of the fold lines formedby foldingthe bag top walls `into closing relation will intersect any ofsaid pasted areas, thereby facilitating the WILLIAM J. GEILIER.

